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Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Letters of Credit At December 31, 2016, we were contingently liable to our principal banks in the amount of $64,225 for letters of credit outstanding primarily related to insurance coverage. Surety Bonds In certain circumstances, we have performance obligations that are supported by surety bonds in connection with our contractual commitments. Litigation We are party to a number of lawsuits, threatened lawsuits and other claims arising out of the normal course of business. Management is of the opinion that liabilities which may result are adequately covered by insurance, or reflected in the self-insurance accruals, and would not be material in relation to the financial position or results of operations.